Bio-remediation of hydrocarbon contaminated site using nitrogen, phosphorus, potassium and urea: A case study of Ogoni clean –Up

Bioremediation of hydrocarbon contaminated soils is a relatively inexpensive and environmentally friendly technology that is applicable over a large area of contaminated site. The paper is a case study of a successful ex situ bioremediation of a hydrocarbon contaminated site in Ogoni Land, Rivers State. The contaminated soils were excavated, treated in an engineered biocell, and sprinkled with nutrient media to enhance microbial population and biodegradation. The biocell was constructed using laterite material. The floor was lined with High Density Polyethylene material. The treatability study of the contaminated soil was conducted to determine the quantity of nutrient required to boost the microbial population in the affected soil. A PNutrient made up of (Nitrogen, Phosphorus, Potassium) NPK 20-10-10 and urea at a quantity established by the EnviTech Calculator was used for the treatment. Due to varying depths and concentrations of the contaminant, nutrient adjustments necessary to enhance rapid microbial population and degradation were noted and undertaken. Soil sampling and analysis were conducted at the end of every treatment cycle to establish reduction of the Total Petroleum Hydrocarbon to an allowable limit. The project has proven to be successful and beneficial in the clean-up and restoration of Ogoni Land.